KR100943093B1 - Pre-treatment agent composition for digital textile printing of polyester and cotton blend fabric and digital textile printing method using the same - Google Patents

Abstract

PURPOSE: A pre-treatment agent composition for digital textile printing of polyester and cotton blend fabric and a digital textile printing method using the same are provided to offer good dyeability while maintaining high concentration of colors in complex materials. CONSTITUTION: A pre-treatment agent composition for digital textile printing of polyester and cotton blend fabric includes a gelling agent, urea-based hydrotrope, nonvolatile alkali and water and has a pH range of 9~11. A digital textile printing method of a pre-treatment agent composition for digital textile printing of polyester and cotton blend fabric includes the following steps: pre-processing polyester and cotton blend fabric with the pre-treatment agent composition; printing the fabric with mixed dye in which disperses dyes and mixed dyes are mixed with printing ink; and coloring the fabric through a steaming process.

Description

Pre-treatment agent composition for digital textile printing of polyester and cotton blend fabric and digital textile printing method using the same}

The present invention relates to a pretreatment composition for digital printing and a digital printing method using the same, and more particularly, it is possible to dye polyester / cotton composite materials at the same time through a single process using digital printing technology, while developing color and sharpness. The present invention relates to a pretreatment composition for obtaining a highly dyeable dye and a digital printing method for simultaneously dyeing a polyester / cotton composite material using a single process using the pretreatment agent.

Printing has been used for a long time as a dyeing technique that can express various colors and patterns. Recently, digital textile printing technology, which is capable of producing small quantities of various types, is gradually being used to cope with the market situation in which a change in fashion is rapidly required and colorful colors and elaborate designs are required.

Digital printing technology applies the hardware and CAD technology of the existing computer to textile printing, and it brings about productivity improvement such as simplification, short delivery, and multi-slot sorting compared to the existing printing process of screen or roller type. It is expected with technology to be able to do. However, in order to apply it to the printing of textiles, the hardware of the textile printer and software for operating the same, the development of ink applicable to various fibers, and the pretreatment agent for each fiber to be adsorbed and fixed to the fibers as much as possible without spreading the dye ink Several technologies, such as pretreatment technology, must be developed in combination.

Among the above technologies, in particular, the development of a pretreatment agent and a pretreatment method is an essential condition for producing high-quality digital printing products, but the technical development in this field has not been systematically made yet.

In other words, when the fabric is digitally printed, the ink may be smeared due to the low viscosity of the ink sprayed from the nozzle and the three-dimensional surface structure of the fabric, and thus, it may not be possible to express vivid colors and patterns. In the case of ordinary screen printing or roller printing, since the viscosity is increased by adding ink to the ink, such a bleeding phenomenon can be prevented, but in the case of digital printing, the nozzle of the printer becomes clogged when adding ink to the ink liquid. There is no way to apply these methods.

Therefore, in the case of digital printing, a method of pre-treating the fabric to be printed to prevent color development and ink bleeding at the same time has been developed. The difference is large for each fiber material, and it is applicable to only a single textile material.

On the other hand, composite materials such as polyester / cotton composites can not only improve the durability and feel by complementing the disadvantages of a single fiber, but also can reduce the cost in terms of price, practicality and fashion Although it has been in the spotlight as a combined material, such composite material has not been developed much about the dyeing method and the pretreatment by digital printing.

This is because the dyeing of composite materials such as polyester / cotton composites is different in the dyeability of each fiber, so in traditional dyeing, such composites have affinity for each fiber by single step dyeing or bathing method. The dyeing method has been adopted by dyeing the fiber with a method suitable for each fiber, which is not applicable to digital printing. That is, even if the printing is performed in two steps, the conditions required for fixing different dye inks are not only different, but also the color stability of the dye due to the shape stability of the desired design pattern and the pretreatment on the fabric which is not suitable for each ink. There is a risk of significantly lowering.

Moreover, for these composite materials, there is no technology for the pretreatment agent which is important for fixing the ink on the fiber in the digital printing technology.

On the other hand, for this reason, a technique is being developed to apply to a material that is difficult to apply to composite materials or digital printing by developing a pigment type ink that does not require a pretreatment process regardless of the current material type, but a pigment type ink has a color development or sharpness dye. It is disadvantageous that it is not suitable for digital printing products which require high color of vivid colors because it is lower than using a type ink.

The present invention has been made to solve the problems of the prior art described above, and to enable the dyeing of polyester and cotton composite material with high color density and excellent sharpness through one printing by digital printing technology. An object of the present invention is to provide a digital printing method of a pretreatment agent composition for digital printing and polyester and cotton composite material using the same.

The pretreatment composition for digital printing of polyester and cotton composite material according to the present invention for achieving the above object,

Up to 10% by weight of a flavor comprising more than 1.0% by weight of carboxymethylcellulose-based additives, 0.3% by weight of sodium alginate and 0.3% by weight of guar gum, based on the total weight of the pretreatment composition; It comprises a urea-based hydrodrop agent, non-volatile alkali and water, characterized in that the pH is in the range of 9-11.

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The digital printing pretreatment composition of the present invention is to be used for pretreatment for digital printing a composite material of polyester and cotton using a digital printing ink including a mixed dye of a disperse dye and a reactive dye.

In the above composition, the above-mentioned materials should be used as the above-described composite materials in which three types of materials are mixed to obtain dyes of color and pattern having high color and sharpness for both cotton and polyester by digital printing. have.

When the concentration of the filler is less than the above concentration, the color development or sharpness is lowered, and even when the concentration is higher than the above concentration, the color development or the sharpness is hardly improved. Rather, the color development is lowered and the workability and the deodorization are lowered. It is undesirable because it will result in harm.

And the urea-based hydrodrop agent is used 12% by weight or less (excluding O%). The hydrotrope agent dissolves dyes and auxiliary components in a small amount of water during the digital printing process, and absorbs the vapor condensed during steaming so as to diffuse and spread the dye on the fabric during printing.

Examples of urea compounds used as hydrotropes include urea, thiourea, hydroxyurea, acetylthiourea, N'-benzoyl, and N-diethylthiourea (N). '-benzoyl, N-diethylthiourea), 1-cyanoisourea, 1,1'-diethylurea, 2,5-dithiobiurea (2,5- dithiourea), N-butylurea (N-butylurea), N-phenylthiourea (N-phenylthiourea), and 1, 3- dipropylurea (1, 3-dipropylurea).

On the other hand, the disperse dye is dyed in the weakly acidic region, the reactive dye is fixed in the alkaline region, in the present invention by adjusting the pH to weakly alkaline as described above using a non-volatile alkali as a pre-fixing agent to the pretreatment composition After pretreatment, digital printing is performed. Non-volatile alkali used for pH adjustment may include Na ₂ CO ₃ , NaHCO ₃ , NaOH, KOH, LiOH, Sodium Silicate, Sodium Phosphate, etc., but use weak alkalis Na ₂ CO ₃ , NaHCO _3, etc. It is desirable to. Even in the case of using weak alkali, since high alkali concentration may cause yellowing, it is more preferable to use it in the range of less than 1% soln.

Under these alkaline conditions, high color development and sharpness are exhibited for both cotton and polyester fibers, and commercially available dyeing results are obtained. The addition of a small amount of nonvolatile acids such as soda within the range of 0.1 to 1% by weight may help to improve color development by improving the fixing stability to the polyester fiber by the dispersion dye.

In addition, the pretreatment composition according to the present invention includes a fluorine- or silicon-based water / oil repellent agent of 3% by weight or less, a adsorption / adhesion enhancer for reactive dyes or disperse dyes, a silica component used for the purpose of increasing color development and clarity by improving dye adsorption, Anti-reducing agents, preservatives, spreading agents and the like may be further added.

The digital printing method of the polyester and cotton composite material according to the present invention, pretreatment using the pretreatment composition for digital printing of the polyester and cotton composite material according to the present invention described above on the polyester and cotton composite material, After printing using a printing ink containing a mixed dye mixed with a disperse dye and a reactive dye, after steaming at 90 to 110 ℃, the temperature is raised to steam at 160 to 190 ℃ two-step steaming The treatment is characterized in that the dye is fixed and developed.

By the first steaming treatment at 90 to 110 ° C., the fixing of the reactive dye is effected effectively, and by the second steaming treatment at 160 to 190 ° C., the dispersion dye is effectively fixed.

After pretreatment using the pretreatment composition for digital printing of polyester and cotton composite material according to the present invention, the polyester and cotton composite material is digitally printed using an inkjet printer or the like using a disperse dye and a reactive dye mixture ink. By doing so, high quality digital printing of polyester and cotton composite materials, which was previously impossible to dye at high concentrations and high sharpness by digital printing, becomes possible.

The pretreatment composition for the polyester and cotton composite material and the digital printing method according to the present invention is also applicable to the digital printing of the composite material of the polyester and other cellulosic fibers such as rayon, hemp.

Hereinafter, the present invention will be described in more detail with reference to Examples.

In each of the following examples and comparative examples, unless otherwise specified, the color development and sharpness of the dyeings obtained by pretreating and digitally printing the polyester and the cotton blend material under the following conditions were compared.

-Exam conditions-

1) Dyeing sample: the following polyester and cotton fabric

PET / cotton mix: 45:55

Inspector density: 312 * 182 ol / 5cm

Theodolite Isle: 75d * 21's

Weight: 129g / ㎡

Organization: Plain weave

2) Pretreatment Process

Using the pretreatment agent of the composition of each Example and the comparative example, it carried out the padding process at the pick-up rate 65-80%, and completely dried using tenter at 120 degreeC for 2 minutes. Each pretreatment agent was adjusted to the same viscosity to 500 cps (Ubbelohde viscometer) using water except for the ingredients described in each table, and 2bar, 2m using the experimental padding mangle (Mathis, 2-roll padder, HVF type) Each pretreatment was padded to the sample to be stained under the condition of / min.

3) digital printing process

Disperse dye ink and reactive dye ink for four-color digital printing of Cyan, Magenta, Yellow, and Black in Table 1 are uniformly mixed at a ratio of 1: 1 in the pretreated dye sample. Mixed dispersion / reactive mixed inks were used to print 720 * 720 dpi images using a Piezo Head digital inkjet printer (Epson Stylus 7500), each of which was equipped with these inks. Using photoPRINT 4.0 as the software, images of each of the blue, red, yellow, and black colors and their mixed colors at 100% concentration in the software were output.

When printing each image, print head was completely cleaned before printing to confirm that the ink discharging head was not clogged. Then, after printing, the print head was blocked due to fear of clogging during printing. After confirming no such output samples were used for the data. In consideration of the reproducibility, the image output was repeated five times and the average value was used.

Manufacturer / Ink Type Color used product name Dupont mixed dyes / dispersions 1: 1 ratio blue  Ujet Reactive Cyan / Ujet Disperse Cyan enemy  Ujet Reactive Magenta / Ujet Disperse Magenta sulfur  Ujet Reactive Yellow / Ujet Disperse Yellow Black  Ujet Reactive Black / Ujet Disperse Black

4) post-treatment process

Images printed fabrics were steamed in saturated steam using a steamer machine (DYS-T21, Daeyang Machinery Co., Ltd.).

When using reactive ink alone, steaming was performed at 103 ° C. for 20 minutes, and when dispersion ink was used alone at 170 ° C. for 8 minutes, and when reaction / dispersion 1: 1 mixed ink was used, the mixture was kept at 103 ° C. for 15 minutes, It heated up to 170 degreeC and steamed for 8 minutes at the 2 step steaming process, or it heated up to 170 degreeC at room temperature for 20 minutes, and steamed at 175 degreeC for 5 minutes.

After the steaming treatment, the dyeing samples were washed with cold water, and then soaped at 60 ° C. for 5 minutes using 0.5 to 1.0 g / l of a polyglycol ether polyamine-based softening agent (Sunlon DK). Soap at 60 ℃ for 5 minutes, and dried naturally with hot water.

5) Evaluation of color development and sharpness

Using the Minolta CM-3600d (Minolta), the color development of the fabric pretreated by the conditions of each example and comparative example was measured three times the color intensity for four colors of blue, red, yellow, and black digitally printed on the pretreated fabric. The average was calculated by calculating the tatal K / S value.

Sharpness prints 0.5mm thick line images (40% blue, red, yellow, and black mixed colors) on pretreated dyed samples in each example or comparative example, and analyzes with tool microscope (Misutoyo TM 510) and automatic image analysis. Using the device (EZ Capture), the thickness of the line printed on the actual fabric was measured 10 times for each part and averaged to determine the sharpness.

The color development and sharpness evaluation results were printed five times on the pretreated dye samples under the conditions of each example and comparative example, and the measured values of the printed samples were averaged.

Example 1, Comparative Examples 1-9

As summarized in Table 2 below, using the pretreatment composition which changed the type of paint, the color development and sharpness of the digital printing of polyester and cotton blend material were tested according to the type of paint. And in Fig. 2, respectively.

division Type of drink ¹⁾ Concentration (% by weight) Urea Usage (wt%) Nonvolatile Alkali Consumption (wt%) Comparative Example 1 SA 2      4      0.5 Comparative Example 2 GG 1.5 Comparative Example 3 CMC 3 Comparative Example 4 HEC 3 Comparative Example 5 PAA 2 Comparative Example 6 PVA 4 Comparative Example 7 SA / GG 1/1 Comparative Example 8 SA / GG / PAA 1.0 / 0.4 / 0.7 Comparative Example 9 SA / GG / HEC 1.0 / 0.4 / 1.5 Example 1 SA / GG / CMC 1.0 / 0.4 / 2

Note 1) SA: Sodium alginate, GG: Guar gum, CMC: Carboxymethyl cellulose, HEC: Hydroxyethyl cellulose, PAA: Polyacrylic acid ( Polyacrylic acid), PVA: polyvinyl alcohol; Same as below

As shown in FIGS. 1 and 2, when a single agent was used as in Comparative Examples 1 to 6, it was not possible to obtain dyeing results with sufficient color development and sharpness by digital printing on polyester and cotton blend materials. appear. In addition, even in the case of a mixture of the agents, sufficient color development and sharpness could not be obtained with a combination of the same composition as Comparative Examples 7 to 9, and when sodium alginate, guar gum and carboxymethyl cellulose-based mixtures were mixed and added Only dyeing with excellent color development and sharpness could be obtained.

Examples 2-3, Comparative Examples 10-11

As summarized in Table 3 below, the type and concentration of the additives and other additives are the same, and the pH of the pretreatment composition is adjusted, depending on the pH range or the use of an acid or an alkali. The color development and sharpness at the time of digital printing were measured and the results are shown in FIGS. 3 and 4, respectively.

division Type of drink Fill concentration (% by weight) Urea (% by weight) Adhesion Class Binder concentration (% soln) pH Comparative Example 10  SA / GG / CMC  1.0 / 0.4 / 2  5 radish - 5.5 ~ 6 Comparative Example 11 Citric acid 0.2 3.5-4 Example 2 Na ₂ CO ₃ 0.4 10 Example 3 Citric Acid / Na ₂ CO ₃ 0.1 / 0.7 10

As shown in FIGS. 3 to 4, when the pH range is adjusted to a neutral to acidic region using no fixing agent or citric acid, as in Comparative Example 10 or Comparative Example 11, color development and sharpness are inferior. Appeared, it could be confirmed that a commercially available dyeing results could not be obtained.

However, in the case of Examples 2 and 3 in which the alkali was adjusted to Na ₂ CO ₃ and the pH was adjusted to about 10, high-chromatic dyes having a color development property of 2 to 3 times higher than those of the comparative examples were obtained. In this case, much better results were obtained in terms of sharpness.

However, even when a small amount of citric acid, which is a kind of non-volatile acid, as in Example 3, the pH of the entire pretreatment composition is the same in the alkaline region, the color development and the sharpness are similar to or the case where only the alkali is added. The results were slightly better within the range, and it was confirmed that the addition of a small amount of non-volatile acid did not affect the dyeing results or resulted in more improved results.

Examples 4-17, Comparative Examples 12-15

As shown in Table 4 below, the color development and sharpness were measured using a mixed color of 100% blue, red, sulfur, and black dyes while varying the amount of use according to the types of the agents, and the results are shown in FIGS. 5 to 6, respectively. .

division SA (% by weight) GG (% by weight) CMC (% by weight) Na ₂ CO ₃ (% soln) Urea (% by weight) Comparative Example 12       1.0 0.1   2         0.4         6 Comparative Example 13 0.2 Example 4 0.3 Example 5 0.4 Example 6 0.6 Example 7 0.8 Comparative Example 14      0.4 0.5 Comparative Example 15 One Example 8 1.5 Example 9 2 Example 10 2.5 Example 11 3 Example 12 0.3   2 Example 13 0.5 Example 14 1.0 Example 15 1.2 Example 16 1.5 Example 17 2.0

As shown in FIGS. 5 and 6, the pretreatment prepared using both sodium alginate (SA), guar gum (GG) and carboxymethylcellulose-based (CMC) agents is not significantly affected by the amount of use, and color development and sharpness All of the castles had excellent dyeing results.

However, Comparative Examples 12 and 13 in which the concentration of guar gum (GG) was 0.2 wt% or less and Comparative Examples 14 and 15 in which the concentration of the carboxymethyl cellulose-based (CMC) agent were 1 wt% or less showed slightly lower color development and sharpness. Indicated. Sodium alginate (SA) resulted in a slightly lower color development than in the case of Example 12 with a low amount of use, but the effect on the sharpness is insignificant, when used at a concentration within the range tested in the Examples It was judged that some satisfactory dyeing results could be obtained.

Examples 18-22, Comparative Examples 16-20

As shown in Table 5 below, the digital printing test was carried out while adjusting the concentration of the alkali used as the fixing agent, and color development and sharpness were measured, and the results are shown in FIGS. 7 to 8, respectively.

division SA (% by weight) GG (% by weight) CMC (% by weight) Na ₂ CO ₃ (% soln) Urea (% by weight) Comparative Example 16      1.0      0.4      2 0      6 Comparative Example 17 0.1 Example 18 0.2 Example 19 0.3 Example 20 0.4 Example 21 0.6 Example 22 0.8 Comparative Example 18 1.0 Comparative Example 19 1.2 Comparative Example 20 1.5

As shown in FIGS. 7 and 8, in Comparative Examples 16 and 17, in which Na ₂ CO ₃ was not added or a small amount of 0.1% soln was added, the pH was low, resulting in unsatisfactory both color development and sharpness. When the Na ₂ CO _{3 content} was over 0.2% soln, the color development and sharpness were excellent up to 1.0% soln. However, when the content exceeds 0.8% Soln, yellowing starts to occur, and when more than 1.0% Soln is used, the yellowing phenomenon is severe.

Therefore, when Na ₂ CO ₃ was used as a fixing agent, it was confirmed that it is preferable to use in a range of 0.2% or more and less than 1.0% sol, mainly from 0.4 to 0.6% solvent, which is excellent in both color development and sharpness. However, when an acid such as citric acid is used together, yellowing starts when Na ₂ CO _{3 is} used in an amount of 0.9 to 1.0% soln or more depending on the amount of use. Therefore, yellowing occurs depending on the type of alkali used or the addition of acid. The timing has changed somewhat.

Example 23, Comparative Examples 21-22

As shown in Table 6 below, the composition of the pretreatment agent was the same, and the conditions of steaming fixation were different, and color development was compared. The results are shown in FIG. 9.

division SA (wt%) GG (% by weight) CMC (wt%) Na ₂ CO ₃ (% soln) Urea (% by weight) Steaming condition Comparative Example 21  1.0  0.4  2  0.4  6 20 minutes at 103 ° C Comparative Example 22 10 minutes at 170 ° C Example 23 After 30 minutes at 103 ° C, 8 minutes at 170 ° C

As shown in FIG. 9, in the case of Comparative Example 21 which was steamed at 103 ° C. suitable for fixing reactive dyes or Comparative Example 22 which was steamed at 170 ° C. required for fixing dye dispersions, sufficient color development was not achieved. As a result, it was only about 2/3 to 1/2 of the Example 23 subjected to the two-step steaming. Therefore, in order to fix dyes in the digital printing of polyester / cotton composites, the desired color development can be obtained only when the steaming conditions are steamed at a temperature suitable for the fixing of the disperse dye and the reactive dye, respectively. Could confirm.

1 and 2 are graphs showing the color development and sharpness evaluation results of the dyeings obtained in Example 1 and Comparative Examples 1 to 9, respectively;

3 and 4 are graphs showing the color development and sharpness evaluation results of the dyeings obtained in Examples 2 to 3 and Comparative Examples 10 to 11, respectively;

5 and 6 are graphs showing the color development and sharpness evaluation results of the dyeings obtained in Examples 4 to 17 and Comparative Examples 12 to 15, respectively;

7 and 8 are graphs showing the color development and sharpness evaluation results of the dyeings obtained in Examples 18 to 22 and Comparative Examples 16 to 20, respectively;

9 is a graph showing the color development and sharpness evaluation results of the dyeings obtained in Example 23 and Comparative Examples 21 to 22, respectively.

Claims (3)

Up to 10% by weight of a flavor comprising more than 1.0% by weight of carboxymethylcellulose-based additives, 0.3% by weight of sodium alginate and 0.3% by weight of guar gum, based on the total weight of the pretreatment composition; A pretreatment composition for digital printing of polyester and cotton composite material, comprising a urea-based hydrodrop agent, a nonvolatile alkali and water, and having a pH of 9 to 11. delete A pre-treatment is carried out using the pretreatment composition for digital printing of the polyester and cotton composite material according to claim 1 on the polyester and cotton composite material pouch, and a printing ink including a mixed dye mixed with a disperse dye and a reactive dye is used. After printing, after the steaming treatment at 90 ~ 110 ℃, the temperature is raised and steamed at 160 ~ 190 ℃ two stages of steaming treatment to fix the dye and polyester, characterized in that the color development Digital printing method of composite material.

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